Drop off in initial broadband speeds

[MacRencephal]

I am fairly new here so please be gentle!

In brief, my query is I have seen a big drop off (c.25%) in my broadband speed after three weeks and I'm curious what might have caused this and what I can do about it, if anything.

In more detail, I had 1Gig broadband installed in mid-March. For the first three and a half weeks when doing a speedtest it was showing download speeds of 1100Mbps+. I was very happy with this. It was consistently around that speed. However, for the last few days when running the same test on the same device in the same position relative to the router I am getting download speeds in the 800s with it not even reaching 900Mbps.

Don't get me wrong - that is still much quicker than I was getting with my previous provider, but it is very disappointing to me that it has dropped by around 25% from what I was initially (and consistently) getting.

I get there is inherently variability in speed depending on a number of factors, but nothing has changed in that time in terms of additional devices, usage of the wifi / broadband when doing the test, etc. etc. so I don't understand why there has been such a big drop off.

I'm hoping someone can explain to me a) what might be causing such a big drop off and b) whether there is anything I can do about it.

Thanks

Mac

[Adduxi]

What does www.samknows.com/realspeed show ?

Post your power levels and network log.   Also setup a BQM to monitor your incoming circuit  www.thinkbroadband.com/ping

Once done we can comment.

[MacRencephal]

Thanks, Adduxi

Samknows is showing router download speed 1138. I don't understand what "post your power levels and network log" means or how and where to find that information, sorry.

I have set-up a Broadband Quality Monitor but this (obviously) doesn't have any results yet. Will post once it's been running for a while.

Thanks

Mac

[newapollo]

Hi Mac,

There are a lot of tech guru's on the forum that can look into your issues but when posting the hub stats they need the full details from the Router Status page. So please  copy/paste 3 FULL sets of data onto here (not screenshots) – from the Downstream, Upstream, & Network Logs pages. 

You need to type 192.168.0.1 into a browser and then click on "Check Router Status" below the log in screen to access the stats.

[Tudor]

How to get stats from a VM hub (no need to logon to the hub)

Open a web browser and go to 192.168.0.1 router mode or 192.168.100.1 modem mode

• Click on the “> Check router status” button
• Click on the “Downstream” tab, copy the text and paste into your reply, do not take a screen shot
• Click on the “Upstream” tab, copy the text and paste into your reply
• Click on the “Networking” tab, copy the text and paste into your reply.
• Do NOT post photos or screen shots they will be rejected as they contain MAC addresses. The board software will automatically change MAC addresses to **:** if done as above.

[carl_pearce]

---

@MacRencephal wrote:

Thanks, Adduxi

Samknows is showing router download speed 1138. I don't understand what "post your power levels and network log" means or how and where to find that information, sorry.

I have set-up a Broadband Quality Monitor but this (obviously) doesn't have any results yet. Will post once it's been running for a while.

Thanks

Mac

---

Based on the speed to the HUB being OK, and your wording in the original post, I'm assuming you are using a WiFi device, presumably WiFi-6 with the speeds posted?

There are many external factors that cause slower WiFi speeds, including other WiFi networks in the local area causing interference.

[MacRencephal]

As suggested, logs are as below.

Thanks

Mac

Downstream bonded channels

Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID

1	411000000	2.3	40	QAM 256	1
2	419000000	2.3	40	QAM 256	2
3	427000000	2.4	40	QAM 256	3
4	435000000	2.5	40	QAM 256	4
5	443000000	2.5	40	QAM 256	5
6	451000000	2.6	40	QAM 256	6
7	459000000	2.6	40	QAM 256	7
8	467000000	2.7	40	QAM 256	8
9	475000000	2.9	40	QAM 256	9
10	483000000	3.1	40	QAM 256	10
11	491000000	3.3	40	QAM 256	11
12	499000000	3.2	40	QAM 256	12
13	507000000	3.2	40	QAM 256	13
14	515000000	3.4	40	QAM 256	14
15	523000000	3.4	40	QAM 256	15
16	531000000	3.6	40	QAM 256	16
17	539000000	3.7	40	QAM 256	17
18	547000000	3.8	40	QAM 256	18
19	555000000	4	41	QAM 256	19
20	563000000	4.2	41	QAM 256	20
21	571000000	4.3	40	QAM 256	21
22	579000000	4.3	41	QAM 256	22
23	587000000	4.3	41	QAM 256	23
24	595000000	4.5	41	QAM 256	24
25	603000000	4.5	41	QAM 256	25
26	611000000	4.6	41	QAM 256	26
27	619000000	4.8	41	QAM 256	27
28	627000000	4.9	41	QAM 256	28
29	635000000	5	41	QAM 256	29
30	643000000	5.2	41	QAM 256	30
31	651000000	5.2	41	QAM 256	31

Downstream bonded channels

Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors

1	Locked	40	9475	0
2	Locked	40	11801	0
3	Locked	40	10210	0
4	Locked	40	10080	0
5	Locked	40	10313	0
6	Locked	40	14016	0
7	Locked	40	17737	0
8	Locked	40	20690	0
9	Locked	40	21600	0
10	Locked	40	21036	0
11	Locked	40	20974	0
12	Locked	40	22736	0
13	Locked	40	22312	0
14	Locked	40	20610	0
15	Locked	40	21312	0
16	Locked	40	20926	0
17	Locked	40	21655	0
18	Locked	40	22070	0
19	Locked	41	19227	0
20	Locked	41	18276	0
21	Locked	40	16154	0
22	Locked	41	16433	0
23	Locked	41	16646	0
24	Locked	41	14874	0
25	Locked	41	16255	0
26	Locked	41	13907	0
27	Locked	41	12741	0
28	Locked	41	11440	0
29	Locked	41	10137	0
30	Locked	41	8503	0
31	Locked	41	8263	0

Upstream bonded channels

Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID

0	60300000	35	5120	QAM 64	1
1	53700000	35.3	5120	QAM 64	2
2	46200000	35.8	5120	QAM 64	3
3	39400000	36	5120	QAM 64	4
4	32600000	36	5120	QAM 64	9
5	23600000	36	5120	QAM 64	10

Upstream bonded channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

0	ATDMA	0	0	0	0
1	ATDMA	0	0	0	0
2	ATDMA	0	0	0	0
3	ATDMA	0	0	0	0
4	ATDMA	0	0	1	0
5	ATDMA	0	0	0	0

Network Log

Time Priority Description

06-04-2023 23:44:39	error	DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
04-04-2023 18:28:00	notice	REGISTRATION COMPLETE - Waiting for Operational status
04-04-2023 18:27:53	notice	DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
04-04-2023 18:27:40	warning	DHCP WARNING - Non-critical field invalid in response ;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
04-04-2023 18:27:38	notice	Honoring MDD; IP provisioning mode = IPv4
04-04-2023 18:27:33	critical	No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
04-04-2023 18:27:30	critical	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
04-04-2023 18:27:18	critical	Cable Modem reboot from UI
15-03-2023 15:16:05	critical	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
15-03-2023 14:42:42	critical	No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
15-03-2023 14:37:17	critical	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
15-03-2023 14:35:14	critical	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
15-03-2023 14:35:04	critical	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
15-03-2023 14:34:55	critical	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
15-03-2023 14:34:42	critical	Cable Modem Reboot due to SW Upgrade
14-12-2022 13:55:36	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;

[MacRencephal]

Correct. I was using a wifi6 device on all occasions from the same position and therefore same distance from the router and using the same app to measure the speed. The outcomes were consistently 1100+ for three weeks but have now dropped off to c.850. I am just trying to understand why this has happened and what I might be able to do to get back to the previous speeds.

Thanks

Mac

[Tudor]

Too many errors, but the figures are accumulative since the hub was last power cycled. So please turn off your hub for a short period, this will reset the counters, then post a new full set of stats after about two hours. This will indicate the current line status. 

[MacRencephal]

That's annoying - I had reset and posted the updated logs here but it appears that post has disappeared. Very strange.